Pressure regulating device of spraying machine

The utility model provides a pressure regulating device of a spraying machine, and belongs to the technical field of machines. The technical problem that a hand wheel of an existing pressure regulating device of the spraying machine can be rotated under the impact of liquid is solved. The pressure regulating device of the spraying machine comprises a valve body and a hand wheel. A liquid inlet is formed in one end of the valve body, a liquid return opening is formed in the side portion of the valve body, and a pressure regulating assembly capable of regulating the flow of the liquid from the liquid inlet to the liquid return opening is arranged in the valve body. The pressure regulating assembly comprises a pressure regulating valve rod. The hand wheel is connected with the valve body in a threaded mode, the hand wheel is connected with the pressure regulating valve rod, and a positioning steel ball and a positioning spring are arranged between the valve body and the hand wheel. A positioning groove is formed in the outer circumferential face of the valve body, the positioning spring is fixed in the positioning groove, and a plurality of limiting grooves are formed in the inner circumferential face of the hand wheel in the circumferential direction. The positioning steel ball abuts against the positioning spring, one hemisphere of the positioning steel ball is placed in the positioning groove, and the other hemisphere of the positioning steel ball is placed in the limiting grooves. The pressure regulating device of the spraying machine has the advantage that the spraying pressure of the liquid can be kept to be constant all the time after pressure regulation.